Large numbers of people who only experience the good side of immigration lack empathy with people who experience the more negative side. I have about 6 immigrant neighbours in my small block alone, but they are the good type - all middle class professionals and no Allans (except Mesut). We have lovely ethnic-owned restaurants nearby and all the non-British kids that go to our kids' school are likely to be middle class because of the catchment area.
Why should immigration bother people like me?